ordinal

For example, in the ordinal 24th the suffix th is counted as another word.

A full stop is placed after most abbreviations, after initial letters, and after ordinal numbers in Roman characters.

Pie, pī, n. a book which ordered the manner of performing divine service: a service-book: an ordinal.

I reach what M. Couturat calls the ordinal theory which is the foundation of arithmetic properly so called.

Still more, why should they not happen with regard to family, ordinal, and class distinctions?